A certain element (X) has isotopes with mass numbers of 10
and 11. The X-10 isotope has an atomic mass of 10.013, and it
represents 19.9% of all atoms of this element. The X-11
isotope has an atomic mass of 11.009, and it represents 80.1%
of all atoms of this element. Therefore, the average atomic
mass, or atomic weight, of this element is
amu.

Select all the correct answers. which statements fail to meet the requirements of a scientific claim? 1 even though evidence indicates that the solar system's planets follow elliptical paths, copernicus's model involving circular orbits is true. 2 the evidence supporting newton's laws of motion was accurate in newton's time, but the universe operates differently today. 3 flowers that reflect the most ultraviolet light are more likely to attract bees and other pollinators than flowers that reflect less ultraviolet light. 4 in the final 100 meters of a 10,000-meter race, an athlete's speed is more strongly related to anaerobic efficiency than to aerobic efficiency.

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

If 360 joules of work are needed to move and create a distance of 4 m what is the weight of the crate